Jury rigging a WiFi controlled speaker selector

My home stereo set up is an NAD c 375bee (150w) and I run three pairs of speakers (hardwired throughout the condo).

My ADCOM GFS-3 speaker selector is cutting out on the left channel intermittently (unusual no?) Anyway, as I seek to replace it, I'm wondering how hard it would be to create a WiFi controlled (or even IR controlled) speaker selector using a product like this (thanks to user @imhififan for recommending it on a different thread.)
https://www.amazon.com/MHCOZY-Channel-Control-Appliance-Compatible/dp/B07MXCWRGX?ref_=ast_bbp_dp&th=1&psc=1

Actually, that switch is meant for power appliances so I need to find the equivalent specs for speakers don't I? But assuming I can find that, would it be ill advised to use just ONE switch for each PAIR of speakers by running only the + or - from each pair through it? I just need to off/on the circuit right? 

If I situate the WiFi switch behind the ADCOM GFS-3 and before each speaker pair then it seems like I could get double duty out of a single switch, or am I missing something? Besides slight cost saving it's the clutter of six switches and the fact that I don't want to have to switchon/off each left and right speaker separately that appeals.

For context: Only one company makes an integrated IR remote speaker selector, the OSD ATM-7 which only handles 100wps and costs a fortune.

Thanks for your insights and suggestions!